Does electron excitation for atoms above hydrogen happen at the valence before the core electrons first? I know that for a gamma ray it is due to the excitation within the nucleus, but what about for normal emission spectra. Do we just shine a bunch of different energy onto the atom and the energies will hit both the valence and the core, or does the valence take the brunt of most of the energy before it hits the core? I think that the electron's are moving around in the probable Energy regions, and if the different electrons in there different energy locations, ex. helium, receive the discrete energy to jump to it's discrete energy gap that is being radiated with the electron it will jump up because the radiation is hitting all the electrons(valence and the core), assuming a constant radiation of a continuum of different energies.